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ISO 2846-1 inks for heat set web offset
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ISO 2846-1 inks for heat set web offset

At 13:31 25-1-2006 +0800, email@hidden wrote: 
Hi Giarte,

This is Nelson Luk and my greeting from Hong Kong.

I do have a question about ISO 2846-2 ink which you said is for web coldset newsprint. SWOP put ISO 2846-2 as the ink for headset #5 paper as well.
Is there any contradiction? Or ISO 2846-2 is accepted both for heatset and coldset web?
Appreciate your comment.

Best,

Nelson

Hi Nelson,
I gave you some info on the ISO 2846-1 inks for heat set applications the other day.
I just compared the ISO values of 2846-1 (heatset) with 2846-2 (coldset)
The L value for K is 18 for heatset and 40 for coldset.
The L value for Y is 91 for heatset and 81 for coldset
A substantial difference in color and saturation (both L and C values)
The Yellow (of course) differs too.
For heatset (ISO 2846-1) a = -5.08 and b = 94.97
For coldset (ISO 2846-2) a = -2.85 and b = 61.79
You can see that Yellow differs a lot.
In this case C and h vary a lot. (Lch values)
I wonder how SWOP could suggest to use the ISO 2846-2 inks for heat set grade # 5 paper.
In the NAPIM document (National Association of Print [Process] Ink Manufacturers)
that was used as input for ISO 2846-2 they stated that SWOP printing
is based on ISO 2846-1.
Conclusion: I doubt that the ISO 2846-2 inks are the optimal inks for heat set web offset.
Even for grade # 5 paper. In spite of the Yellowish paper color. I think.
Any comments from real-world web offset printers or ink specialists?
Regards,
Henk Gianotten



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